Merge pull request tensorflow#8106 from Jiaming-Liu/patch-1

Fix a bug of initializing

Author: Dandelion Mané

tensorflow/python/ops/variable_scope.py

@@ -683,6 +683,9 @@ def _get_single_variable(self,
         init_val = initializer
         variable_dtype = None
       else:
+        # Instantiate initializer if provided initializer is a type object.
+        if isinstance(initializer, type(init_ops.Initializer)):
+          initializer=initializer(dtype=dtype)
         init_val = lambda: initializer(  # pylint: disable=g-long-lambda
             shape.as_list(), dtype=dtype, partition_info=partition_info)
         variable_dtype = dtype.base_dtype